Double-disk furrow-opener.



F. R. PACKHAM.

DOUBLE DISK FURROW OPENER.

APPLICATION FILED JAN.22, 191s.

Patented Nov. 18, 1913.

concave surfaces of such disks. Attempts have been made to obviate this difficulty by forming the disks with flat circles, such disks being known as saw-blade disks.7 These disks, however, are very expensive and difficult to manufacture in a proper manner. To overcome these objections, I construct the disk in the nature of a hollow frustum of a cone so that its inner and outer sides will be formed on straight lines from the central opening thereof to theperiphery, as shown in Fig. l. The method of making this disk consists in first punching the disk 'in a fiat circular form with a central circular opening, heating` the same and then drawing the middle portion outwardly, preserving a practically straight line from the center of the disk to the outer periphery. By this construction I am not only enabled to obtain a lia-t plane for the scrapers on both sides of the disk, but by the drawing of the metal also relieve all tendency for the metal to buckle or draw crooked, thereby producing at minimum expense a true disk for the purpose intended at a cost 'far beneath the present saw-blade construction. I am enabled also to provide ample and uniform room above the hubs of the disks for the oil-conduit and hollow column surrounding the same.

In Fig. 2 are shown scrapers, 17 for the exterior of the disk and also Scrapers, 1S, for the interior thereof, of the usual form illustrating the manner in which the same may be applied to a disk of my improved. construction.

Having thus described my invention, l claim 1. In a double disk furrow opener, a support, oppositely and angularly arranged bushings in said support, said bushings being laterally adjustable in said support but held from rotation therein, a pair of disks, an inwardly-extending angularly-arranged trunnion on each of said disks, said trunnions being rotatably mounted in said bushings but held from lateral movement with respect thereto so as to be movable therewith., and means for simultaneously moving said bushings toward each other.

2. ln a double disk furrow opener, a support, oppositely and angularly arranged bushings in said support, said bushings' being adjustable laterally in said support but held from rotation therein, disks rotatably mounted in said bushings and movable therewith, each of said bushings having` a beveled face, and movable beveled projections coacting with said faces to move said bushings and disks toward each other.

3. In a double disk furrow opener, a support, oppositely and angularly arrange bushings in said support, said bushings being movable laterally in said support but held from rotation therein, disks having trunnions rotatably mounted in said bushings, plates connected with the ends of said trunnions and embracing the inner ends of said bushings to hold said trunnions therein, said bushings having inclined faces, and adjustable inclined projections coacting with said faces to move said bushings and disks toward each other.

4. In a double disk furrow opener, a support, oppositely and angularly arranged bushings in said support, said bushings being movable laterally in said support but held from rotationtherein, disks rotatably mounted in said bushings and movable therewith, an oil-conduit, beveled projections upon the end of said conduit, said bushings having inclined faces coacting with said beveled projections, and means for adjusting said oil-conduit whereby said bushings and disks may be moved toward each other, and held in position in said support.

5. In a double disk furrow opener, a support, oppositely and angularly arranged bushings in said support.l said bushings being movable laterally in said support but held from rotation therein, disks rotatably mounted in said bushings and movable therewith, each of said bushings having an oil chamber, an adjustable oil-conduit communicating with said oil chambers, and means whereby when said conduit is adjusted, the bushings and disks will be moved toward each other. l

6. In a double disk furrow opener, a support, oppositely and angularly arranged bushings in said support movable laterally but held from rotation therein, disk-carrying trunnions rotatably mounted in said bushings and movable therewith, each of said bushings having a chamber communicating with its corresponding trunnion, the inner wall of each of said chambers being formed inclined, an oil-conduit communicating with said chambers, oppositely-arranged beveled projections on the lower end of said oil-conduit coacting with said beveled faces, and means for adjusting said voil-conduit whereby said bushings and trunnions 'may be moved toward each other.

ln testimony whereof, have hereunto set my hand this 13th day of January, 1913.

FRANK R. PACKHAM.

Witnesses ROY H. Kirn, Giras. l. WELCH.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

